Registers an array of keys for getting updates from the server.
Valid only for a Native Client region when client notification
( SetClientNotificationEnabled(Boolean) ) is true.
Should only be called for durable clients and with cache server version 5.5 onwards.

if not connected to the GemFire system because the client cannot
establish usable connections to any of the servers given to it.
For pools configured with locators, if no locators are available, innerException
of NotConnectedException is set to NoAvailableLocatorsException.